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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4c7e00ac228b33ff11ecb57de42afde8ab155575b59d2f7d1f2b71b4e9aacc5' 
  AND token = 'WbkCom1E2i/jB9tLyaqbeJcJk1JxF0QVIM2VL/ZGPEM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}